package cn.copera.kaka.controller;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

import javax.imageio.ImageIO;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

public class MatrixToImageWriter {
	private static final int BLACK = 0xFF000000;
	   private static final int WHITE = 0xFFFFFFFF;
	 
	   private MatrixToImageWriter() {}
	 
	   
	   public static BufferedImage toBufferedImage(BitMatrix matrix) {
	     int width = matrix.getWidth();
	     int height = matrix.getHeight();
	     BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	     for (int x = 0; x < width; x++) {
	       for (int y = 0; y < height; y++) {
	         image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
	       }
	     }
	     return image;
	   }
	 
	   
	   public static void writeToFile(BitMatrix matrix, String format, File file)
	       throws IOException {
	     BufferedImage image = toBufferedImage(matrix);
	     if (!ImageIO.write(image, format, file)) {
	       throw new IOException("Could not write an image of format " + format + " to " + file);
	     }
	   }
	 
	   
	   public static void writeToStream(BitMatrix matrix, String format, OutputStream stream)
	       throws IOException {
	     BufferedImage image = toBufferedImage(matrix);
	     if (!ImageIO.write(image, format, stream)) {
	       throw new IOException("Could not write an image of format " + format);
	     }
	   }
	   public static void main(String[] args) throws Exception {
		    String text = "二维码内容，可以是链接也可以是文本";
		    int width = 200;
		    int height = 200;
		    Hashtable hints = new Hashtable();
		    hints.put(EncodeHintType.CHARACTER_SET, "utf-8");//内容所使用编码  
		    BitMatrix bitMatrix = new MultiFormatWriter().encode(text, BarcodeFormat.QR_CODE, width, height, hints);

		    File outputFile = new File("d:/barcode.jpg");
		    //File.separator
		    String format = "jpg";//二维码的图片格式  
		    MatrixToImageWriter.writeToFile(bitMatrix, format, outputFile);

		  }

}
